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Патент USA US3078923

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Feb. 26, 1963
Filed oct. 19, 1960
2 Sheets-Sheet 1
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Feb. 26, 1963
c. c. ANTI-IES
Filed om. 19, 1960
2 sheets-sheet 2
United States Patent G "ice
Patented F eb; 26, 1963
type of fuel gas and then only for a limited range of pre
Clifford C. Antlles, Union, NJ., assignor to Union Car
heat gas ñows. In order to go from one fuel gas to an
other orto enlarge the preheat ñow range of ya given fuel
gas in order to cut material either thinner or thicker than
that for which the torch was originally intended, a differ
ent throat section has to be installed in the torch in the
time consuming manner outlined above to obtain opti
bide Corporation, a corporation of New York
Filed Oct. 19, 1960, Ser. No. 63,585
1 Claim. (Cl. 15S-27.4)
This invention relates to cutting torches, and more par
mum operation.
ticularly to oxyfuel blowpipes employed for severing fer
rous metals and the like.
The use of fuel gases other than acetylene for hand and
machine metal-cutting operations has been increasing
steadily over the past few years. Indications are that this
Because of this lack of ready adaptability to suit vary
ing cutting requirements on the part of standard cutting
torches, it is necessary for the user to either stock a mul
tiplicity of cutting torches, the number depending upon
the range of cutting applications prevailing in his particu
increase will continue due in large part, to the consider
able cost advantage enjoyed by such gases as methane or
n-atural gas. Such fuel gases, supplied from low pressure
(1/2 p.s.i. or less) gas lines in particular, have become in
creasingly popular as a source of fuel lfor gas cutting
lar shop, or sutfer a sacrifie in eñiciency of operation in
terms of longer cutting times and poorer cut quality.
Either result is undesirable from an economics point of
view. Stocking a multiplicity of torches involves a large
initial capital outlay as Well as large continuing mainte
nance costs. If eñiciency of operation is sacrificed, poor
This shift to low pressure fuel gases for gas cutting has 20 quality cuts may well result in an increase in subsequent
necessitated the development of cutting torch apparatus
machining required as well as higher labor costs due to the
particularly tailored for use with these fuels. For exam
increase in labor time required to complete a given cut
ple, torches with greater preheat gas ilow capacity than
ting operation.
could be supplied by standard Oxy-acetylene cutting
The cutting torch of this invent-ion supplies the desired
torches are required. This is due to the fact that greater 25 «degree of versatility in performance by providing a torch
volumes of both fuel gas and preheat oxygen are required
which is readily converted to produce the optimum oper
to provide the equivalent heat output or preheat llame ef
ating performance over a Wide range of preheat gas ñows
fectiveness produced using acetylene as the fuel.
and types of fuel gas. This has been accomplished ac
In oxygen cutting operations, the objective is to raise
cording to the invention by making the throat section of
the temperature of the material to be cut to its ignition 30 the torch an integral part of an easily replaceable in
point in the shortest possible time to initiatethe cutting
jector-throat assembly. Thus, it is possible to adapt the
action and then to maintain the material in the area of the
cutting torch of the invention to provide the opimum op
cut at this ignition temperature as the cutting action pro
erating conditions required for a given application merely
gresses across the material.
by inserting an injector-throat assembly specifically ,tai
To accomplish this objective in the most efficient man 35 lored for the particular fuel gas and preheat llow needed.l
ner, there is an optimum combination of `cutting torch in
Therefore, instead of stocking a multiplicity of cutting
jector and throat that will provide the best operation for
torches, it is merely necessary for the user, having a vari
a given preheat gas flow and pressure range and a given
ety of cutting operations to perform, to stock a sufficient
type of fuel gas; that is, the injector of a low pressure in
number of injector-throat assemblies to cover his range
jector-type torch is tailored to supply a lim-ited range of 40 of operations.
preheat flows with a given type of fuel gas. There is one
An additional advantage gained from having-the throat
section of the torch an integral part of the injector-throat
optimum throat diameter in combination with this injector
which will provide the optimum performance. '
assembly is that the end clearance between the forward
Should the preheat flow range required for a particu
end of the injector unit and the mouth of the throat sec
lar cutting operation be either above or below that for 45 tion is maintained at a fixed value. This end clearance is
» a critical factor in maintaining preheat flame stability;
which the throat was designed, the result will be a sacri
fìce in performance by way of longer initial preheat time,
that is, resistance to backfire and flashback; and there is
an optimum clearance which provides the greatest degree
longer cutting time to complete the cut, and a poor qual
of stability.
ity cut. This is due to the fact that the primary function
In the drawings:
of the throat section of an injector-type torch is to pro 50
FIG. 1 is a plan of a blowpipe embodying the invention;
vide just the right build-up of gas velocity directly down
stream of the injector to produce the most efficient as
FIGS. 2 and 3 are front and rear portions of a longi
tudinal cross section through >the blowpipe shown in
piration of fuel gas into the mixed gas ñow (combined
oxygen and fuel gas preheat gas).
FiG. l;
FIG. 4 is a cross section through the valve block;
lf the diameter of the throat section is less than the
FIG. 5 is an enlarged cross section of the central por
optimum, the effect is to destroy the injector aspirating
efficiency due to a choking oiï of the injector through a
tion of the blowpipe; and
FIG. 6 is a cross section taken along line 6-6 of
buildup of gas pressure just ahead of the throat section.
If the diameter of the throat is greater than the optimum,
FIG. 5.
The cutting blowpipe shown in the drawings comprises
there will be an insufficient build-up of gas velocity for 60
a nozzle head H connected by a cutting oxygen tube C
maximum eñiciency of aspiration. Similar results will be
had with the use of a fuel gas other than that for which
and a preheat gas conduit M to a valve block B to which
the injector and throat were designed.
In standard cutting torch apparatus, while the injector
unit is easily replaced, the throat is an integral part of the
torch assembly and not an easily replaced item. That is,
oxygen is supplied at inlet O and fuel gas at inlet A.
Oxygen enters the valve block B from the inlet O
through a passage 10V into chamber 1I, from which its pas
sage to the cutting oxygen tube C and the preheat gas
conduit M is regulated by valves 12 and 13 respectively.
it is necessary to disasscmble the torch head from the
Thus the combustion-supporting oxygen passes from
cutting oxygen tube and mixed gas tube, install a new
the chamber 1li to a duct 14 in the valve block, the far end
mixed gas tube containing the desired size throat, and
then reassemble the head in order to replace the throat 70 of which provides a valve seat and is closed by the valve
13. This valve is carried by a threaded Valve stem 15
section of the torch. As a result, a given standard cutting
torch readily provides optimum operation only for one
operated by a handle 16 to move against the valve seat
associated. with the duct-14 or to be retracted from this
seat into a valvevchamber l-’l whichfis formed in thevalve
block B.
The valve block B has a through bore 19 aligned with
preheat gas conduit M, and a cross passage 18? connects
the valve chamber 17 with the back end of the bore 1.9.
Accordingly, by turning> the handle 16,` combustîon~supporting- oxygen may be' permitted to` iiow into the valve
gas entering the forward end of bore 19 iiows through
annular passage 54 to arcuate passages 51 and thence to
the clearance between conical nose 34 and conical rear
passage portion 30 where it is aspirated into the central
passage 28 in the throat section 20 to become mixed with
the preheat oxygen.
This- injector throat- assembly of- throat section 20, in
jector 23, tube 24 and, sealing member 25 is inserted
chamber 1‘7` and thence through the cross passage 18 to
through the bore 19' with the front end of the throat sec
the back end ot the bore.19l
10 tion 20 abutting the inside ofthe nozzle head H. The
The: flow of fuel gas from inlet A to the forward end
nut 45 is tightened to compress spring 46 to hold the
of bore 19 in the valve block B, through passages not
assembly iny position under spring pressure and still allow
shown, is- regulated by valve 50, similar in construction
for heat expansion of the parts;
tovalve 1'3.
It will be seen that by having the throat section 20,
According to the present invention, the preheat gas‘con 15 injector 23‘, preheat oxygen tube 24 and sealing member
duit M is a continuous tube from the valve block B, to
25- all rigidly connected together not only provides for
which it is gas-tightly connected as by silver soldering> at'
their readyY removability from the cutting torch as an
21, to the nozzle head H to which it is gas-tightly con
integral assembly but also ensures maintaining a tixed
nected as by silver soldering at 22; The injector throat
optimum clearance between the conical nose 34 on the
assembly inserted through the bore 19 in the. valve block 20 injector 23 and the conical rear passage portion 30 of
B1 and; preheat‘ gas conduit;v M` comprises` a throat section
the ‘throat section 20 necessary to maintain preheatv flame
20;. anínjector 23,'` a'preheat oxygen tube 24, andl an in
jector sealing member 25“,` allrigidly connected together.
What is claimed is:
In a cutting blowpipe having a valve block and- a
front portion: 29 expanding forwardly in conical formI 25 nozzle head, a> preheat tube connecting said valve block
toward: theV headf H, and a« backf portion: 30 expanding
to- said nozzle- head, and1 a removable- injector-throat as»
rearwardly in conical form and terminating` in a cylindri
sernî‘bly unit ins'erted‘ through said valve block into said
call entrance 32>havingfan annular rimr 33.
preheat gas tube; said unit comprising a throat section
The. injector 23 has aconical'nose 34' entering the` coni
separate from saidpreheat gas tube and of a diameter to
cal` rear passage portion 30 of the throat* section with a 30 slide inside' thereofv forwardly toward' said nozzle head;`
iìxedî optimum clearance, and al cylindrical? portion 35 ex-’
said throat section having an axial passage expanding
tending‘rearwardlyv and having radiali tins 346 fitting inside
rearwardly in conical form and terminating‘in a cylindri
the cylindrical' entrance 32 of the throat section: The in
cal entrance having an annular rim; an injector having a
jector'also has an annular groove 37> intersectingy the fins'
conicalE nose' entering saidA conical form` with a' clearance
36.l 'I"l1e:sectionsl 39‘of'the tins 36 to the re‘arï of annular 35 and'y a cylindrical" portion extending rearwardly therefrom
groove 37' arerlate?ally‘extended to contact the cylindricall
inside of's'aid cylindrical entrance, and a rear portion of
wall of the. preheaty gas tube M. The forward. faces' of
larger diameter iitting inside said preheat tube,` said in
tliese‘ fin` extensions' adjacent the groove` 37' are fused to
jector also having an axial passage aligned with said
the rear annular rim> 33- of the throat section as by silver
throat passage, saidY injector also having longitudinally
solder 38. The arcuate passages 51 between the tins 36 40 extending fuel gas passages outside of and surrounding
provide communication for fuel gas ñow from the an~
said axialE passage, said rear portion of said injector hav‘
nulár‘passage 54, between the oxygen tube 24 and the pre
ing a forward face outside of said surrounding passages
heat gas conduit M, to the. tixed’ optimum clearance be
and rigidly and permanently secured to said annular rim`
tween the conical nose 34 of the injector and the conical
of said throat section, whereby removal of said injector
rear passage portion 30 of the throat section.
45 out through' said valve block carries said throat section
The injector 231 also has. a- central passage 40' aligned'
with the throat passage and terminating in a rear socket
42; The: front end of the oxygen tube- 24 is ñtted intoï
References Cited in the file of this patent
tliisIsocket and silver soldered intothe sealing member 25l
in registry'with axial‘passage53 inthe sealing member 25. 50
Iacobsson- ___________ .__ Apr. 23, 1940`
01 ring 52 is an annular groove in the periphery ofy seal
Jacobsson etal. ...... __ Apr. 23, 1940
ing member 25 seals off the oxygen» inlet into the rear of
Iacobsson et al. ______ _- Dec. 23, 1941
bore 19 from the fuel gas inlet in the forward end of
'Iïhethroat'sectionf 20 has a> central' passage Z8 with a'.>
bore 19.
Thus, preheat oxygen entering the rear of'bore 1-9v passes 55
successively through axial passagel 53 in scaling member
25, oxygen tube 24, central passage 40 in the injector 23
to the central passage 28 in the throat section 20, Fuel>
Germany ____________ __ Feb. 26, 1930
Great Britain ___., ____ -_ July 29, 1953
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